Hiking Calorie Calculator
Hiking Calorie Calculator
Personal Details
Hike Details
Leave at 0 to use Naismith's Rule estimate
Terrain & Conditions
Trip Planning
Enter Your Hike Details
Fill in your body weight, distance, elevation gain, terrain, and pack weight to see your estimated calorie burn, fat loss, hike difficulty, and trip food planning results.
Estimate calories burned, fat loss, difficulty, and trip food needs for any hike
Planning a day hike in the mountains or a week-long backpacking expedition? Knowing how many calories you burn hiking is one of the most important pieces of information for safe and enjoyable outdoor adventure. Under-fueling on the trail leads to fatigue, poor decision-making, and even hypothermia risk in cold conditions — while over-packing unnecessary food wastes precious weight in your pack. Our Hiking Calorie Calculator uses Metabolic Equivalent of Task (MET) values from published sports science research to estimate your total calorie burn with precision. Unlike simple walking calculators, this tool accounts for the full picture: your body weight, the load on your back, the grade and type of terrain underfoot, altitude above sea level, and even the ambient temperature. Each of these factors meaningfully changes how hard your body works — and how many calories you need to replenish. The terrain surface alone has a dramatic effect. Hiking through loose sand (MET ≈ 8.0) burns about 45% more energy per hour than walking on blacktop (MET ≈ 5.5). Deep snow (MET ≈ 10.0) can nearly double the caloric cost of flat-trail hiking. And as you climb steeper grades, energy expenditure rises sharply — a 10-percent grade more than doubles caloric burn compared to flat terrain, while grades above 15 percent can triple it. Elevation gain and altitude add separate challenges. Naismith's Rule — a classic hillwalking formula — lets the calculator estimate your hiking duration from distance and elevation alone when you don't know your exact time: one hour per 5 km of distance plus one hour per 600 m of ascent. At high altitude (above 12,000 ft / 3,658 m), reduced atmospheric oxygen forces your body to work harder, adding roughly 5–10% to calorie expenditure. For backpackers and thru-hikers, the integrated trip planner uses the FarOut methodology to calculate total calorie needs across multiple days, separating hiking hours, sleeping hours, and resting hours. The food weight estimator then converts those calories into pounds and kilograms of carry weight based on your chosen dietary fat-to-carb ratio — because high-fat foods (9 kcal/g) pack more energy per ounce than carbohydrate-heavy foods (4 kcal/g). The results include a calorie breakdown chart (base metabolism vs. hiking effort vs. pack load), a terrain comparison bar chart, and hike difficulty scoring from Easy to Extreme. You can export all results to CSV for trip planning spreadsheets, or print a summary to carry on your hike. Whether you are planning a casual trail walk, a steep summit attempt, or a 7-day wilderness trek, this calculator gives you the data to fuel your adventure correctly.
Understanding Hiking Calorie Science
What Is MET and How Does It Apply to Hiking?
Metabolic Equivalent of Task (MET) is a standardised measure of exercise intensity. A MET of 1 equals the energy expended at rest (approximately 1 kcal/kg/hour). Hiking cross-country on a dirt trail carries a MET of about 6.0, meaning it burns roughly six times as much energy as sitting still. The core formula is: Calories = MET × body weight (kg) × duration (hours). MET values vary by terrain type — from 5.5 on blacktop to 10.0 in deep snow — and are further adjusted upward for steeper grades, heavier packs, high altitude, and extreme temperatures. Published Compendium of Physical Activities MET tables (Ainsworth et al.) provide the scientific basis for these values.
How Are Hiking Calories Calculated?
The calculator determines a base MET from your terrain type selection, then adds grade-based and pack-weight adjustments. Grade adjustments range from +0.5 MET for gentle slopes under 5% to +2.8 MET for very steep terrain above 15%. Pack weight adjustments are: light pack under 5 kg (+0.3 MET), moderate 5–15 kg (+0.5 MET), heavy 15–25 kg (+0.8 MET), and very heavy over 25 kg (+1.5 MET). Altitude above 12,000 ft applies a 7.5% multiplier; cold and hot temperatures add 7% and 6% respectively. For trip planning, the FarOut methodology applies separate caloric coefficients for hiking (3.1745 kcal/lb/h), sleeping (0.4541 kcal/lb/h), and resting hours. Naismith's Rule auto-estimates hike duration when you leave time fields blank.
Why Does Calorie Planning Matter for Hikers?
Accurate calorie planning prevents the two most common trail nutrition mistakes: under-fueling and over-packing. A demanding 12-mile mountain hike may burn 2,000–3,500 kcal in addition to your basal metabolic needs — effectively doubling your daily caloric requirement. Failing to replace those calories leads to bonking, fatigue-related trip and fall accidents, and impaired cold-weather thermoregulation. Conversely, over-packing food adds unnecessary weight to your pack, increasing calorie burn in a cycle that is hard to escape on long expeditions. Food weight planning is especially critical for thru-hikers and wilderness backpackers who must carry all calories between resupply points hundreds of miles apart.
Limitations and Accuracy Notes
MET-based formulas are population averages and can vary ±15–20% between individuals based on fitness level, hiking efficiency, actual pace, and metabolic variation. The calculator does not account for descending terrain recovery (downhill burns fewer calories than flat hiking), changing grades mid-hike, or rest breaks. For elderly hikers and those with low aerobic fitness, actual burn may be 10–15% higher than predicted. High-altitude estimates become less reliable above 18,000 ft where altitude sickness significantly alters exertion capacity. The food weight estimator assumes uniform macro ratios throughout the trip and does not account for the additional calories required for camp cooking fuel. Use these estimates as planning guides, not medical prescriptions, and always carry surplus food on serious expeditions.
How to Use This Hiking Calorie Calculator
Enter Your Personal Stats
Input your body weight, gender, and age. For the most accurate BMR-adjusted results, also add your height. Choose Imperial (lbs, miles, feet) or Metric (kg, km, meters) using the toggle at the top of the form.
Fill In Your Hike Details
Enter your backpack weight, total hiking distance, and elevation gain. For duration, enter your expected hours and minutes — or leave both at zero to have the calculator automatically estimate your time using Naismith's Rule (a classic mountaineering formula based on distance and ascent).
Select Terrain and Conditions
Choose your terrain type (dirt trail, loose sand, deep snow, etc.), average grade, altitude range, and ambient temperature. These environmental factors can change your calorie burn by 30–100%. High altitude and extreme temperatures each add significant metabolic cost.
Configure Trip Planning (Optional)
For overnight or multi-day trips, set your trip duration in days, daily hiking and sleeping hours, camp activity level, and dietary fat ratio. The calculator will output total trip calories, daily food weight, and total food weight to carry — essential for resupply planning on long trails.
Frequently Asked Questions
How many calories does hiking burn per hour?
For an average 180-lb (82 kg) person hiking on a dirt trail with no pack, the burn rate is approximately 430–500 kcal per hour. Adding a 20-lb pack increases this to roughly 475–550 kcal/h. Steep terrain (>10% grade) can push the hourly rate above 700–900 kcal. Deep snow hiking at the same weight and duration can reach 820+ kcal/h due to its MET of 10.0. These figures scale proportionally with body weight — a 200-lb hiker burns roughly 11% more than a 180-lb hiker under identical conditions.
What is Naismith's Rule and how does the calculator use it?
Naismith's Rule is a hiking planning formula developed in 1892 that estimates walking time from distance and elevation gain. The formula is: Time (hours) = Distance (km) ÷ 5 + Elevation gain (m) ÷ 600. In imperial terms: Time = Distance (miles) ÷ 3 + Elevation gain (ft) ÷ 2,000. When you leave the duration fields at zero, the calculator automatically applies Naismith's Rule and notes that the duration is estimated. This is useful when you know your route but not your expected pace. The estimate assumes average fitness and does not account for rest breaks or descent penalties.
Does pack weight significantly affect calorie burn?
Yes, pack weight has a meaningful impact. A light pack under 5 kg adds approximately 0.3 to your base MET value, while a heavy pack of 15–25 kg adds 0.8 MET. A very heavy pack over 25 kg (such as resupply loads or winter camping gear) adds 1.5 MET. For a 180-lb hiker on a 4-hour hike, the difference between no pack and a heavy 30-lb pack can be 200–350 additional calories burned. This is why backpackers generally burn significantly more calories than day hikers over equivalent terrain.
How does altitude affect calorie burn while hiking?
Hiking at high altitude (above 12,000 ft / 3,658 m) increases caloric expenditure by approximately 5–10% compared to sea level. Reduced atmospheric oxygen at altitude lowers haemoglobin oxygen saturation, forcing the cardiovascular and respiratory systems to work harder to deliver the same amount of oxygen to working muscles. The acclimatisation period further elevates metabolic rate. The calculator applies a 7.5% adjustment for high-altitude hikes. For reference, Kilimanjaro's summit crater is at 19,341 ft and ultra-high altitude Himalayan approaches can reach 18,000+ ft where this effect is even more pronounced.
How much food should I carry on a multi-day hike?
Food weight depends on caloric density and your daily energy needs. Most experienced backpackers target 1.5–2 lbs (0.7–0.9 kg) of food per person per day, delivering roughly 2,500–3,500 kcal. The calculator's food weight estimator uses the dietary fat ratio you select to compute weight: fat provides 9 kcal per gram while carbohydrates and protein provide 4 kcal per gram. High-fat diets (35–43% fat) give more calories per ounce — which is why expedition rations and freeze-dried backpacking meals are deliberately high-fat. A 28% fat ratio (medium range) is a good default for most hikers who mix regular and high-calorie trail food.
What is hike difficulty and how is the score calculated?
The difficulty score is calculated from a formula that combines total elevation gain relative to distance with total mileage: Score = (((elevation_ft ÷ (miles × 5,280)) × 100 × 4) + √(miles² × 6)) ÷ 2.5. The resulting score maps to: below 3 = Easy, 3–5 = Moderate, 6–8 = Hard, 9–14 = Strenuous, 15+ = Extreme. For example, a 5-mile hike with 1,000 ft of gain scores approximately 4.5 (Moderate), while a 10-mile hike with 4,000 ft of gain scores about 12 (Strenuous). This formula was originally developed by NWHiker.com and provides a practical relative difficulty estimate for trip comparison and permitting purposes.